Same here! I have never turned on the resistive heating on my 80 gallon hybrid HWH.
Of course, it is now acting up again with an almost constant alarm and not heating as it should. I really need to replace it, but I am not in the mood to pay $2500+ for a simple water heater (what a ripoff! Those things should be under $1000, it’s a simple tank, heat exchanger, and a tiny compressor, and one really simple circuit board). Plus, I’m not sure if I am strong enough to lug it into place to install it. Installing it is easy, would take me an hour or two as I already have flexible screw hoses for most connections except the condensate drain and the emergency pressure valve. Here are some photos -
Condensate drain -
Hot water output and emergency pressure valve output -
